Microsoft has made available an open-source code testing tool called code-testing-generator. This tool, part of the dotnet/skills repository, can analyze a repository, identify the programming language and test framework in use, and then generate and run unit tests. According to internal testing, the tool performed better than GitHub Copilot on a 152-task benchmark, completing 140 tasks compared to Copilot's 120. The tool's improved performance was particularly notable on vague prompts and diff-targeted requests. The release of this tool could potentially benefit developers by providing a more effective code testing solution. This development matters as it may lead to improved code quality and reduced debugging time for developers.